linux-kernel - Re: [PATCH 07/13] mm: meminit: Initialise a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 23 Apr 2015 16:56:07 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Linux-MM <linux-mm@...ck.org>
Cc:	Nathan Zimmer <nzimmer@....com>,
	Dave Hansen <dave.hansen@...el.com>,
	Waiman Long <waiman.long@...com>,
	Scott Norton <scott.norton@...com>,
	Daniel J Blueman <daniel@...ascale.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/13] mm: meminit: Initialise a subset of struct pages
 if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set

On Thu, Apr 23, 2015 at 11:33:10AM +0100, Mel Gorman wrote:
> This patch initalises all low memory struct pages and 2G of the highest zone
> on each node during memory initialisation if CONFIG_DEFERRED_STRUCT_PAGE_INIT
> is set. That config option cannot be set but will be available in a later
> patch.  Parallel initialisation of struct page depends on some features
> from memory hotplug and it is necessary to alter alter section annotations.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>

I belatedly noticed that this causes section warnings. It'll be harmless
for testing but the next (hopefully last) version will have this on top

diff --git a/drivers/base/node.c b/drivers/base/node.c
index d03e976b4431..97ab2c4dd39e 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -361,14 +361,14 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 #define page_initialized(page)  (page->lru.next)
 
-static int get_nid_for_pfn(struct pglist_data *pgdat, unsigned long pfn)
+static int __init_refok get_nid_for_pfn(unsigned long pfn)
 {
 	struct page *page;
 
 	if (!pfn_valid_within(pfn))
 		return -1;
 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
-	if (pgdat && pfn >= pgdat->first_deferred_pfn)
+	if (system_state == SYSTEM_BOOTING)
 		return early_pfn_to_nid(pfn);
 #endif
 	page = pfn_to_page(pfn);
@@ -382,7 +382,6 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
 {
 	int ret;
 	unsigned long pfn, sect_start_pfn, sect_end_pfn;
-	struct pglist_data *pgdat = NODE_DATA(nid);
 
 	if (!mem_blk)
 		return -EFAULT;
@@ -395,7 +394,7 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
 	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
 		int page_nid;
 
-		page_nid = get_nid_for_pfn(pgdat, pfn);
+		page_nid = get_nid_for_pfn(pfn);
 		if (page_nid < 0)
 			continue;
 		if (page_nid != nid)
@@ -434,7 +433,7 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
 	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
 		int nid;
 
-		nid = get_nid_for_pfn(NULL, pfn);
+		nid = get_nid_for_pfn(pfn);
 		if (nid < 0)
 			continue;
 		if (!node_online(nid))
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/